Reset all settings iphone 5s

Hy i have an iphone 5s who i try to reset all settings from the phone.

I do this now it is like 55-60% done but i start it 3 days ago.WHY take so much?
I want to add i try to install ios 8.1.3 on iphone 6plus and it takes like 5 hours to dw the ios.

It isn't normal because i do this 2st time in 1 month i downgrade from ios 8.1.3 before apple close this .

When i install it first time the dw takes 1 hour or 40 min.

It is because of apple? Or why my iphone 5s still loading this step from 3 days -4 now.

Please help me!